Teekitoliy



W; s. GLARKSON.

FLUID PRESSURE REGULATOR.

Patented Feb. 21, 1888.

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Unrrnn STATES Parana tries.

\VILLTAM S. CLARKSON, OF GLENDIVE, IVIONTANA tlERlllTOltY.

FLUID-PRESSURE REGULATOR.

SPECIFICATION forming part of Letters Patent No. 378,291, dated February 21. 1

Application filed October 14, 1887.

To aZZ whom, it may concern:

Be it known that 1, WILLIAM S. CLARKSON, a citizen of the United States of America, residing at Glendive, in the county of Dawson and Territory of Montana, have invented certain new and useful Improvements in Fluid-Press ure Regulators; and I do hereby declare the following to be afull, clear, and exact description of the inventiomsuch as will enable others skilled in' the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

My invention relates to an improvement in fluid-pressure regulators for use in connection with airbrakes; and it consists in the novel combination and arrangement of the parts thereof, which will be more fully hereinafter described, and pointed out in the claims.

The valve is adapted to be attached to the pipe leading to the brake cylinder of airbrakes and admit a given pressure of air into the same. If, for examplathe leverage on a car is calculated for fifty pounds per square inch and the reservoir has eighty pounds, the valve is set for fifty pounds, the brake is applied, and as soon as the cylinder receives fifty pounds the valve operates to cut off the surplus air and prevents the car wheels from sliding.

The object, therefore, of my improvement is to provide a valve for regulating the quantity of air flowing into and consequently the pressure upon the brake-cylinder, cutting 0d the surplus pressure, and thereby preventing the car-wheels from sliding when the brake is ap plied.

In the accompanying drawings, wherein like letters of reference indicate similar parts in the several views, Figure 1 is a sectional view of my improved form of valve. Fig. 2 is a hori zontal section on the line (a m of Fig. 1. Fig. 3 is a detail perspective view of the valve stem and the parts carried thereby.

A indicates the body of the valve, having tapped pipe-connections a a formed in each side thereof, with ports E and F therein, and having a top inner screw-tapped surface, a and a lower outer screw-tapped surface, 0?. A top cap, A, is rcmovably secured with the Serial No.25l3l'l'. (No model.)

upper portion of the body A, and is formed with a recess of suitable configuration to re ceive the upper end of the valve-stem. A bot-tom cap, A is secured to the lower portion ofthe body A, and is constructed hollow, with a bottom air-egress opening, a".

The body A is constructed with two differentsized cylinders, in the smaller one of which the valve H is mounted, and in the other the piston-head G. The valve and storm I are contrally mounted in the body A, havingaflangedisk, (1, formed with the upper portion of said stem, which bears against a shoulder formed in the lower portion of the top cap, A, the said stem being enlarged above said flangedisk d to form a stable bearing for the upper end of said stein. Some distance below the flange-disk d an enlarged collar, (2, is formed,

and between the fiangedisk (l and the collar (2 a valve, H, is mounted. One side of the valve-stem between the disk d and collar (2 is flattened, and between said surface and the inner square surface of. the valve a flat spring, S, is mounted, being constructed of greater length than the distance between the disk (I and the collar d, and slightly bowed to be inserted between said parts in vertical position.

The valve H is constructed with an opening, H, in one side thereof, which is substantially rectangular, and extends back into the body of the valve. The sides H on each side of said opening are straight, with front bevels, h, and rear curvatures, h, merging into the curved side H of the valve, which bears against the wall of the upper cylinder. Across the opening H a small rod, h is mounted, which is seated in the two sides, H, adj accnt thereto. This rod it, in connection with the spring S, aids to retain the valve H in a positive connection with the valve-stem I. The lower portion of the curved side H of the valve H is formed with a shoulder, 7?, which forms an open passage for the egress of the air. Immediately below the collar (2 another collar, B, is mounted on the stem I, which is formed with a peripheral groove, 1), for engagement therewith of a wire spring, B, and is also constructed with a lower shoulder, Z). An annular dish-shaped leather packing, G, is provided, within which the collar 13 is set, the peripherally mounted wire spring B IOC thereof bearing against the said packing and acting to produce a tighter connection against the cylinder, as will be readily understood.

The lower end of the stem I is provided with a piston, G, which is retained thereon against the packing O and collar B by a nut, G, which engages with the lower screw-threaded end of the stem 1. The piston G, packing O, and collar B have movement in the lower enlarged cylinder of the valve-body A below the valve H. A coiled spring, S, is mounted in the hollow portion of the lower cap, A and bears at its upper end against the lower side of the piston G and at .its lower end upon a washer, g, in the lower internal portion of the said cap A Through the ingressport E of the connec tion a in the valve-body A a bushing, W, is mounted, which projects into the body and into the opening H between the sides H of.

the valve H, and prevents the said valve from becoming displaced, and guides the same in its vertical movement.

The operation of the valve is as follows: The air enters the port E in the connection a through the valve and out through the port F in the connection a to the brake-cylinder. As soon as the desired pressure is obtained the stem I, piston G, and valve H,attached thereto, move downward, bringing the valve H over the port in the connection a, and thereby prevent the further entrance of air into the brakecylinder. To increase the pressure, another washer, g, is applied, and to decrease the pressure the said washer is removed. This change in the arrangement will either increase or lessen the resiliency of the spring S, and consequently increase or reduce theresistance against the downward pressure of the valve-stem and the parts carried thereby. The port F in the connection a is about double the size of the port E in the connection a, which is owing to the insertion of the bushing within the said latter connection. In case, therefore, of a sudden application of air, the port E being larger than the port E, pressure is prevented within the valve, and the valve H will not be moved over the port F before the desired pressure is obtained in the brake-cylinder. The port F is slightly flattened at its lower side to increase the size thereof and allow the air to pass through as free as possible until the valve H covers it. When the stem l, piston G, and valve H ascend, the ports E and F are opened and the air escapes through the triple valve in using automatic air and through the train-pipe and out of the engineers valve in using straight air.

The hole a in the lower portion of the lower cap, A is for the purpose of allowing air to escape therethrough, which would collect therein in case the packing 0 should leak, and thus avoid interference with the downward movement of the piston.

The utility and adaptability of my improvement being obviously apparent, it is unnecessary to further enlarge upon the same herein.

Having thus described my invention,what I claim as new is- 1. The combination of the body of the valve, having the upper and lower caps and the side connections provided with ingress and egress ports, the valve-stem centrally mounted within the body, having a disk, d, and collar d thereon, the open-sided valve mounted in connection with said stem between said disk and collar, the pistonhead at the lower end of said stem, the dish-shaped packing-ring between said piston-head and lower collar, d, the bushing proj ectinginto the valve, and the coiled spring bearing against the under side of the piston-head, substantially as described.

2. The combination of the body having the upper and lower caps and the side connections having ports, the spring-actuated valvestem, the open-sided valve carried at the up.- per portion of said valve-stem, and the bushing projecting into the said valve and acting as a guide therefor, substantially as described.

3. The cornbinatiomwith thevalve-bodyhaving the bushing projecting inward through one side thereof, of the centrally-mounted valvestem having an upper disk, (I, and a collar, d, below said disk, the valve having a rectangular opening mounted on said stem between said disk and collar, the flatspring between said stem and valve, and the rod passing across the opening of said valve and bearing against the valve-stem, substantially as described.

4. The combination, with the valve-body, of the centrally-mounted spring-actuated valvestem, the piston G, the collar B, having the peripheral spring b, and the dish shaped washer 0, within which said collar B sets, substantially as described.

5. The combination, with the body of the valve, of the valve-stem, the valve H, carried at the upper end thereof, the piston-head G at the lower end thereof, and the collar B and dishshaped packing 0 above said piston-head, substantially as described.

6. The combination of the valve-body having an upper and lower cap and two cylinders of different dimensions and two side ports, the centrally-mounted valve-stem having disks thereon with a space between the same, the valve carried on the upper portion of said stem between said disks, the packingring having a circular spring pressure exerted against the same to formatight joint, the piston-head and retaining-n ut, the coiled spring bearing against said piston-head, and the washer in the lower apertured cap, against which the lower end of the spring bears, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM S. OLARKSON.

W'itnesses:

E. S. BECKER, A. L. SMITH. 

